Use this site to get started with R and R Studio.
Install R first!
Choose your CRAN mirror (it doesn't matter which location you choose.)
Download R for your computer (mac, Windows, or Linux)
Install R Studio next!
Find the appropriate operating system
Download R Studio
Instructional Videos
Free Online Resources
An Introduction to R Programming by Ercan Karadas
A Little Book of R for Time Series by Avril Coglan